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DIY & Tutorials
DIY, Audio & Video Tutorials
How to: PVR - mobile media.
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<blockquote data-quote="Steerpike" data-source="post: 309264" data-attributes="member: 807"><p>Macrovision is easy to remove. It applies to composite analogue video. It does 2 things:</p><p>1) adds rubbish white levels on the first few lines of the picture, which are supposed to be off-screen. This upsets the ALC of a recorder,so you get a dark picture or one of random brightness.</p><p>2) adds a DC offset to the colour burst on the last few tens of lines; this makes recorders think the vertical sync sequence has arrived early, and vertical hold is lost.</p><p>Both effects can be removed by use of a line counter, and clamping the video to black during the 'problem' period.</p><p>Digital disc recorders are not affected by the Macrovision artefacts, BUT they are firmware programmed to look for its fingerprint and not record if it looks like Macrovision is present. Remove the above artefacts, and they don't recognise the Macrovision.</p></blockquote><p></p>
[QUOTE="Steerpike, post: 309264, member: 807"] Macrovision is easy to remove. It applies to composite analogue video. It does 2 things: 1) adds rubbish white levels on the first few lines of the picture, which are supposed to be off-screen. This upsets the ALC of a recorder,so you get a dark picture or one of random brightness. 2) adds a DC offset to the colour burst on the last few tens of lines; this makes recorders think the vertical sync sequence has arrived early, and vertical hold is lost. Both effects can be removed by use of a line counter, and clamping the video to black during the 'problem' period. Digital disc recorders are not affected by the Macrovision artefacts, BUT they are firmware programmed to look for its fingerprint and not record if it looks like Macrovision is present. Remove the above artefacts, and they don't recognise the Macrovision. [/QUOTE]
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DIY & Tutorials
DIY, Audio & Video Tutorials
How to: PVR - mobile media.
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